<mat-form-field>
  <input matInput value="Disco party!" placeholder="Message" #message>
</mat-form-field>

<mat-form-field>
  <input matInput value="Dance" placeholder="Action" #action>
</mat-form-field>

<button mat-button (click)="openSnackBar(message.value, action.value)">Show snack-bar</button>
